Saw-swage.



No. 876,198. PATBNTED JAN. 7, 1908. v

0. A. KNOWLES.

SAW SWAGE.

APPLICATION FILED APR.17, 1907.

E- I T I E.

Snueufoz 2814mm PATENT OFFICE.

CHARLES A. KNOWLES, OF FRIEND, OREGON.

SAW-SWA GE Specification of Letters Patent.

Patented Jan. '7, 1908.

Application filed April 1'7. 1907. Serial No. 368.688:

To all whom 'it may concern:

Be it known that 1, CHARLES A. KNowLns, a citizen of the United States, residing at Friend, in the county of \Vasco, State of Oregen, have invented certain new and useful Improvements in SawSwages, and I do hereby declare the following to be a full, clear, and exact description of the ii vention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has relation to devices for swaging the dragteeth of crosse'ut-saws.

Drag-teeth are employed in saws of the kind mentioned to carry the sawdust resulting from the action of the cutting or working teeth out of the kerf. It is essential to the perfect operation of a crosscut-saw that the kerf should be completely cleared of sawdust and all wood between the walls of the kerf that has been cut loose from the body of the timber, at each drag of the saw. The difference between the action of a straight dragtooth and a swaged drag-tooth is that the former operates, as its name signi'lies, to simply drag the sawdust or a portion of it out of the kerf, while the latter, in effect, carries it out completely and cuts and carries away all particles of wood between the walls of the kerf at its bottom. In addition to the necessity of swaging the drag .teeth, it is essential to their perfect operation that they should be swaged uniformly. To the extent that this fails of being done, im-

perfection in the operation of the saw will result.

The object of my invention, having in mind the foregoing statement of facts, is to produce a saw-swage that will effect uniformly perfect swaging of the drag-teeth, which device shall also be simple in construction, and. economical and ready of manufacture.

The nature of the invention is fully and clearly ascertainable from the device portrayed in the annexed drawings, forming a part of this specification, in view of which it will first be described with respect to its construction and mode of operation and then be pointed out in the subjoined claims.

Of the said drawingsFigure 1 is a side view partly in section, of my improved swage for the drag-teeth of saws. Fig. 2 is aview similar to Fig. 1 illustrating the invention as applied and its mode of operation. Fig. 3 is a side view of a portion of a saw-blade shox ing swaged and unswaged drag-teeth.

Similar numerals of reference designate similar parts or features, as the case may be, wherever they occur.

In the drawing A designates the shank of the swagii'ig tool that is provided in its anvil end B with a socket or recess C the outer portion of which recess has a vertical or straight wall 1 and an opposite inclined wall 2, conforming to the shape of the drag-tooth of a saw at an appreciable distance inward from the point toward the base. In the inner portion of the recess C, the wall 1 is cut away in the direction of the inclination of the wall 2, as indicated at 3, and the said. inclined wall is curved in the direction of its inclination so as to gradually extend at an angle of about sixty degrees. The recess (,3 may take the form of a hole in the anvil end of the tool, which hole may open out at the side of said end portion, as representrnl at 4.

In the use of the tool, it will be engaged with a rake-tooth (L of a saw by setting it thereon with the point I) projecting into the recess C, and then by a stroke or successive strokes of a hammer on the upper end of the shank A the tool will be driven on the teeth a with the result of upsetting or turning the point I) outward to a degree determined by the curvature of the inclined side of the recess at the point 4 and the extent that the tool can be driven on the tooth, the said extent being limited by the breadth of the said recess (J. The cutting away of the wall 1 at the point 3, it will now appear obvious, is to obviate any liability of the engagement or contact of the swaged point I) with anything that might break or damage it.

The tool will be made of line hardened steel, and the walls of the recess will be finished with the utmost nicety, particularly at the point 4 where the swaging of the tooth is effected; and while I have given a degree of curvature at the said point 4, it is to be understood that the same is merely an instance. The eurvature may vary from that stated according to varying circumstances or requirements, d no to the structural character of the teeth.

In Fig. 2 the process of swaging a tooth is shown, while in Fig. 3 at the right are shown a pair or set of drag teeth that have been swaged, and on the right a set of said teeth are indicated as unswaged. The tool will, of course be reversed in position when acting upon opposite teeth of a pair.

What is claimed isinclined wall is curved toward the space 00- 10 A swage for the drag-teeth of a saw comcasioned by cutting away thevertical wall. prising a shank having an anvil end pro- In testimony whereof,laffix my signature, vided with a recess, the outer portion of in presence of two witnesses. which recess has one end wall eXtendin in a relatively vertical plane while the opfiosite CHARLES N Wall is inclined from its outer end toward the Witnesses:

Vertical wall, and in the inner portion of the C. G. BALLARD, recess the vertical wall is cut away and the GEO. W. JOHNSTON. 

